<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style>
    html {
      background-color: red;
    }

    html.websqldatabase {
      background-color: green;
    }
  </style>
</head>
<body>
  <script src="modernizr.min.js"></script>
</body>
</html>
